R P/I-XP55T2P4 Pentium Motherboard USER'S MANUAL
USER'S NOTICE No part of this product, including the product and software may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language in any form by any means without the express written permission of ASUSTeK COMPUTER INC. (hereinafter referred to as ASUS) except documentation kept by the purchaser for backup purposes.
ASUS CONTACT INFORMATION ASUSTeK COMPUTER INC. Marketing Info: Address: Telephone: Fax: Email: 150 Li-Te Road, Peitou, Taipei, Taiwan, ROC 886-2-894-3447 886-2-894-3449 info@asus.com.tw Technical Support: Fax: BBS: Email: WWW: Gopher: FTP: 886-2-895-9254 886-2-896-4667 tsd@asus.com.tw http://www.asus.com.tw/ gopher.asus.com.tw ftp.asus.com.
CONTENTS I. INTRODUCTION ........................................................ 1 How this manual is organized .......................................................... 1 Item Checklist .................................................................................. 1 Features of This Motherboard .......................................................... 2 II. FEATURES ................................................................. 2 Parts of the Motherboard .........................................
CONTENTS BIOS Features Setup ................................................................ 30 Details of BIOS Features Setup: ......................................... 31 Chipset Features Setup ............................................................. 33 Power Management Setup ........................................................ 36 Details of Power Management Setup: ................................ 37 PNP and PCI Setup ..................................................................
FCC & DOC COMPLIANCE Federal Communications Commission Statement This device complies with FCC Rules Part 15. Operation is subject to the following two conditions: • • This device may not cause harmful interference, and This device must accept any interference received, including interference that may cause undesired operation. This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules.
I. INTRODUCTION I. INTRODUCTION (Manual / Checklist) How this manual is organized This manual is divided into the following sections: I. Introduction: II. Features: III. Installation: IV. BIOS Setup: V. ASUS DMI Utility: VI. ASUS PCI-SC200: VII. ASUS I-A16C: VIII. DOS/Win3.1x: IX.
II. FEATURES Features of This Motherboard The ASUS P/I-XP55T2P4 is carefully designed for the demanding PC user who wants a great many features in a small package. This motherboard: • • II. FEATURES (Features) • • • • • • • • • • 2 Easy Installation: Is equipped with BIOS that supports auto detection of hard drives and Plug and Play to make setup of hard drives and expansion cards virtually automatic. Multi-Processor/Multi-Speed Support: Supports one Pentium (75-200MHz), Cyrix P166+ (Rev 2.
II. FEATURES • PCI Bus Master IDE Controller: Comes with an onboard PCI Bus Master IDE controller with two connectors that supports four IDE devices in two channels, provides faster data transfer rates, and supports Enhanced IDE devices such as Tape Backup and CD-ROM drives. This controller supports PIO Modes 3 and 4 and Bus Master IDE DMA Mode 2. BIOS supports IDE CD-ROM or SCSI boot-up. Optional IrDA: This motherboard supports an optional infrared port module for wireless interface.
III. INSTALLATION III. INSTALLATION (Map of Board) PS/2 Keyboard PS/2 Mouse CPU Vcore Volt (2.5-2.9) 2.5 2.7 2.8 2.9 JP1 Res. CPU Volt (STD/VRE) Bus Freq. JP9 JP10 Freq.
III. INSTALLATION 1) JP14 2) JP18 3) JP15 4) JP16 5) JP17 6) JP19 7) JP9, JP10 8) JP12, JP13 9) JP1 10) Vcore p. 7 p. 7 p. 8 p. 8 p. 9 p. 9 p. 10 p. 10 p. 11 p.
III. INSTALLATION Installation Steps Before using your computer, you must complete the following steps: 1. 2. 3. 4. 5. 6. Set Jumpers on the Motherboard Install DRAM and SRAM Modules Install the Central Processing Unit (CPU) Install Expansion Cards Connect Ribbon Cables, Cabinet Wires, and Power Supply Setup the BIOS Software 1. Jumpers III. INSTALLATION (Jumpers) Several hardware settings are made through the use of jumper caps to connect jumper pins (JP) on the motherboard.
III. INSTALLATION Jumper Settings 1. Total Level 2 Cache Size Setting (JP14) This jumper sets the total amount of L2 cache that is present. If you have both onboard cache chips (see "Map of Motherboard" for locations) and a Cache Expansion Slot, then you have 256KB. If you only have onboard cache chips, then you have 512KB. An "ASUS" or "COAST" cache module can be used to upgrade the 256KB version to 512KB. If there is no onboard cache, you may install a cache module of either 256KB or 512KB.
III. INSTALLATION 3. Memory Cacheable Size (JP15) The default of 64MB uses only the onboard TAG SRAM which allows cacheable memory up to 64MB. If you install DRAM above 64MB and wish to allow cacheable memory above 64MB, you need to install a TAG SRAM upgrade or use a cache module with an extended TAG SRAM (such as 256KB ASUS CM1 Rev 3.0 with 2 TAG SRAM's) but not both and set this jumper to 512MB. See page 12 for TAG SRAM upgrade and page 14 for cache module information.
III. INSTALLATION 5. CMOS RAM (JP17) This clears the user-entered information stored in the CMOS RAM of the Real Time Clock such as hard disk information and passwords. To clear the CMOS data: (1) Turn off the PC, (2) Set jumper to "Clear," (3) Power on the PC, (4) Turn off the PC, (5) Set jumper to "Operation," (6) Power on the PC, (7) Hold down during bootup and enter BIOS setup to re-enter user information.
III. INSTALLATION 7. CPU External Clock (BUS) Frequency Selection (JP9, JP10) These jumpers tells the clock generator what frequency to send to the CPU to allow the selection of the CPU’s External frequency (or BUS Clock). The BUS Clock times the BUS Ratio equals the CPU's Internal frequency (the advertised CPU speed). 8. CPU to BUS Frequency Ratio (JP12, JP13) These jumpers set the frequency ratio between the Internal frequency of the CPU and the External frequency (called the BUS Clock) within the CPU.
III. INSTALLATION 9-10. Single/Dual Power Plane CPU Voltage Regulator Selections The following jumpers set the voltage supplied to the CPU. Determine whether your CPU has a Single Power Plane or Dual Power Planes and then the voltage that it uses. When a single power plane CPU is installed, the dual power plane selections will be automatically disabled. When a dual power plane CPU is installed, the single power plane selections will be automatically disabled.
III. INSTALLATION 2. System Memory (DRAM & SRAM) This motherboard supports four 72-pin SIMMs of 4MB, 8MB, 16MB, 32MB, or 64MB to form a memory size between 8MB to 256MB. The DRAM can be either 60ns or 70ns Fast Page Mode (Asymmetric or Symmetric) or EDO. To support ECC, you must use true (opposed to phantom parity generated by logic chips) 36-bit parity-type DRAM (e.g. 8 chips + 4 parity chips) in pairs for all modules. Mixing 32-bit non-parity DRAM (e.g. 8 chips) and 36-bit DRAM (e.g.
III. INSTALLATION DRAM Memory Installation Procedures: 1. The SIMM memory modules will only fit in one orientation as shown because of a "Plastic Safety Tab" on one end of the SIMM sockets which requires the "Notched End" of the SIMM memory modules. 1 2 3 4 Notched End Bank 1 III. INSTALLATION (DRAM Memory) Bank 0 72 Pin SIMM DRAM Sockets & Module 2. Press the memory module firmly into place starting from a 45 degree angle making sure that all the contacts are aligned with the sockets. 3.
III. INSTALLATION Static RAM (SRAM) for Level 2 (External) Cache The motherboard you purchase may have either 0KB, 256KB, or 512KB onboard. If you have both onboard cache chips (see "Map of Motherboard" for locations) and a Cache Expansion Slot, then you have 256KB. If you only have onboard cache chips, then you have 512KB. An "ASUS" or "COAST" cache module can be used to upgrade the 256KB version to 512KB. If there is no onboard cache, you may install a cache module of either 256KB or 512KB.
III. INSTALLATION 3. Central Processing Unit (CPU) The motherboard provides a 321-pin ZIF Socket 7 that is backwards compatible with ZIF Socket 5 processors. The CPU that came with the motherboard should have a fan attached to it to prevent overheating. If this is not the case then purchase a fan before you turn on your system. Apply thermal jelly to the CPU top and then install the fan onto the CPU. WARNING: Without a fan, the CPU can overheat and cause damage to both the CPU and the motherboard.
III. INSTALLATION 4. Expansion Cards WARNING: Make sure that you unplug your power supply when adding or removing expansion cards or other system components. Failure to do so may cause severe damage to both your motherboard and expansion cards. ATX power supplies may power on if certain motherboard components or connections are touched by metallic objects. First read your expansion card documentation on any hardware and software settings that may be required to setup your specific card.
III. INSTALLATION cards. The original ISA expansion card design, now referred to as “Legacy” ISA cards, requires that you configure the card’s jumpers manually and then install it in any available slot on the ISA bus. You may use Microsoft's Diagnostic (MSD.EXE) utility included in the Windows directory to see a map of your used and free IRQs. For Windows 95 users, the "Control Panel" icon in "My Computer," contains a "System" icon which gives you a "Device Manager" tab.
III. INSTALLATION ASUS MediaBus Card ASUS MediaBus allows a cost-efficient solution to a complete multimedia system. The advantages of using one add-on card is to reduce the slot requirements and compatibility problems in order to maximize the Plug and Play advantages. The add-on card inserts into the shared PCI 4 / MediaBus 2.0 Slot. NOTE: This motherboard uses MediaBus Rev. 2.0. The previous MediaBus cards designed for MediaBus Rev. 1.2 will not fit into the MediaBus Rev 2.0 that is on this motherboard.
III. INSTALLATION 5. External Connectors WARNING: Some pins are used for connectors or power sources. These are clearly separated from jumpers in "Map of the Motherboard" on page 4. Placing jumper caps over these will cause damage to your motherboard. IMPORTANT: Ribbon cables should always be connected with the red stripe on the Pin 1 side of the connector. The four corners of the connectors are labeled on the motherboard. Pin 1 is the side closest to the power connector on hard drives and floppy drives.
III. INSTALLATION 5. ATX Power Supply Connector (20-pin block) This connector connects to a ATX power supply. The plug from the power supply will only insert in one orientation because of the different hole sizes. Find the proper orientation and push down firmly making sure that the pins are aligned. 12.0V 5VSB PW-0K GND 5.0V GND 5.0V GND 3.3V 3.3V 5.0V 5.0V -5.0V GND GND GND PS-ON GND -12.0V 3.
III. INSTALLATION 6. Primary / Secondary IDE connectors (Two 40-pin Block) This connector supports the provided IDE hard disk ribbon cable. After connecting the single end to the board, connect the two plugs at the other end to your hard disk(s). If you install two hard disks, you must configure the second drive to Slave mode by setting its jumpers accordingly. Please refer to the documentation of your hard disk for the jumper settings.
III. INSTALLATION 8. IDE Activity LED (IDE_LED) This connector connects to the hard disk activity indicator light on the case. + IDE_LED IDE Activity LED 9. System Power LED (CON1) This 2-pin connector lights the system power LED when the motherboard has power. Works the same as the next System Power LED. See the figure on the next page. III. INSTALLATION (Connectors) 10.
III. INSTALLATION 12. ATX Power Switch (CON1) (ATX Power Supply Only) The system power is controlled by a momentary switch connected to this lead. Pushing the button once will turn on the system and pushing another time will turn off the system. The system power LED shows the status of the system's power. This connection does not have a function when a standard power supply is used. See the figure below. 13.
III. INSTALLATION 15. CPU Cooling Fan Connector (FAN) This connector supports a CPU cooling fan of 500mAMP (6WATT) or less. Orientate the fan so that the heat sink fins allow airflow to go across the onboard heat sink(s) instead of the expansion slots. Depending on the fan manufacturer, the wiring and plug may be different. The red wire should be positive, while the black should be ground. Connect the fan's plug to the board taking into consideration the polarity of the this connector.
III. INSTALLATION Power Connection Procedures III. INSTALLATION (Power Connections) 1. After all jumpers and connections are made, close the system case cover. 2. Make sure that all switches are in the off position as marked by . 3. Connect the power supply cord into the power supply located on the back of your system case as instructed by your system user's manual. 4. Connect the power cord into an power outlet that is equipped by a surge protector. 5.
IV. BIOS SOFTWARE Support Software FILELIST.TXT - View this file to see the files included in the support software. PFLASH.EXE - This is the Flash Memory Writer utility that updates the BIOS by uploading a new BIOS file to the programmable flash ROM chip on the motherboard. To determine the BIOS version, check the last four numbers of the code displayed on the upper left-hand corner of your screen during bootup. Larger numbers represent a newer BIOS file.
IV. BIOS SOFTWARE 2. Update BIOS Main Block from File This option updates the BIOS from a file on the disk. This can either be a new file or a backup file created by the “Save Current BIOS to File” option. This will not update the Boot Block if the Boot Block is different. You will be prompted with the following if advanced features if necessary. Boot Block of New BIOS is different from old one !!! Please Use 'Advanced Feature' to flash whole bios !!! 3.
IV. BIOS SOFTWARE Updating your Motherboard's BIOS 1. Download an updated BIOS file from Bulletin Board Services (BBS) or the internet (WWW) and save to the diskette you created in step 1 of the Main Menu. See ASUS CONTACT INFORMATION on page II. 2. Turn off your computer and open the system cabinet to Enable "Boot Block Programming" jumper as shown in section III. 2. Boot from the floppy diskette you created in step 1 of the main menu. 3. At the "A:\" prompt, type: PFLASH 4.
IV. BIOS SOFTWARE 6. BIOS Setup The motherboard supports two programmable Flash ROM chips: 5 Volt and 12 Volt. Either of these memory chips can be updated when BIOS upgrades are released. Use the Flash Memory Writer utility to download the new BIOS file into the ROM chip as described in detail in this section. All computer motherboards provide a Setup utility program for specifying the system configuration and settings.
IV. BIOS SOFTWARE Load Defaults The “Load BIOS Defaults” option loads the minimized settings for troubleshooting. “Load Setup Defaults”, on the other hand, is for loading optimized defaults for regular use. Choosing defaults at this level, will modify all applicable settings. A section at the bottom of the above screen displays the control keys for this screen. Take note of these keys and their respective uses.
IV. BIOS SOFTWARE Details of Standard CMOS Setup: Date To set the date, highlight the “Date” field and then press the page up/page down or +/- keys to set the current date. Follow the month, day and year format. Valid values for month, day and year are: Month: Day: Year: 1 to 12 1 to 31 up to 2099 Time To set the time, highlight the “Time” field and then press the page up/page down or +/- keys to set the current time. Follow the hour, minute and second format.
IV. BIOS SOFTWARE For IDE hard disk drive setup, you can: • Use the Auto setting for detection during bootup. • Use the IDE HDD AUTO DETECTION in the main menu to automatically enter the drive specifications. • Enter the specifications yourself manually by using the “User” option. The entries for specifying the hard disk type include CYLS (number of cylinders), HEAD (number of read/write heads), PRECOMP (write precompensation), LANDZ (landing zone), SECTOR (number of sectors) and MODE.
IV. BIOS SOFTWARE Drive A, Drive B These fields record the types of floppy disk drives installed in your system. The available options for drives A and B are: 360KB, 5.25 in. 1.2MB, 5.25 in. 720KB, 3.5 in. 1.44MB, 3.5 in. 2.88MB, 3.5 in. None To enter the configuration value for a particular drive, highlight its corresponding field and then select the drive type using the left- or right-arrow key. Floppy 3 Mode Support This is the Japanese standard floppy drive. The standard stores 1.2MB in a 3.
IV. BIOS SOFTWARE BIOS Features Setup This “BIOS Features Setup” option consists of configuration entries that allow you to improve your system performance, or let you set up some system features according to your preference. Some entries here are required by the motherboard’s design to remain in their default settings. IV. BIOS (BIOS Features) A section at the lower right of the screen displays the control keys you can use. Take note of these keys and their respective uses.
IV. BIOS SOFTWARE External Cache These fields allow you to Enable (default) or Disable the CPU’s “Level 2” secondary cache. Caching allows better performance. Quick Power On Self Test This field speeds up the Power-On Self Test (POST) routine by skipping retesting a second, third, and forth time. Setup default setting for this field is Enabled. A complete test of the system is done on each test.
IV. BIOS SOFTWARE Typematic Rate Setting When enabled, you can set the two typematic controls listed next. Setup default setting is Disabled. Typematic Rate (Chars/Sec) This field controls the speed at which the system registers repeated keystrokes. Options range from 6 to 30 characters per second. Setup default setting is 6; other settings are 8, 10, 12, 15, 20, 24, and 30. Typematic Delay (Msec) This field sets the time interval for displaying the first and second characters.
IV. BIOS SOFTWARE Chipset Features Setup (BIOS Features) This “Chipset Features Setup” option controls the configuration of the board’s chipset. Control keys for this screen are the same as for the previous screen. Auto Configuration The default setting of 60ns DRAM sets the optimal timings for items 2 through 9 for 60ns DRAM modules. If you are using 70ns DRAM modules, you must change this item to 70ns DRAM. See pages 12-13 for DRAM installation information.
IV. BIOS SOFTWARE [DRAM and ECC] If all your DRAM modules have parity chips (e.g. 8 chips + 4 parity chips), they are considered 36bits. This motherboard sums the memory per bank and therefore two modules will give 72bits and the following will be displayed: If your DRAM modules do not have parity chips (e.g.
IV. BIOS SOFTWARE Onboard Parallel Port This field sets the address of the onboard parallel port connector. You can select either: 3BCH / IRQ 7, 378H / IRQ 7 (default), 278H / IRQ 5, Disabled. If you install an I/O card with a parallel port, ensure that there is no conflict in the address assignments. The PC can support up to three parallel ports as long as there are no conflicts for each port. Parallel Port Mode This field allows you to set the operation mode of the parallel port.
IV. BIOS SOFTWARE Power Management Setup This “Power Management Setup” option allows you to reduce power consumption. This feature turns off the video display and shuts down the hard disk after a period of inactivity. IV. BIOS (Chipset Features) Details of Power Management Setup: IV. BIOS (Power Management) Power Management (User Defined) This field acts as the master control for the power management modes. There are four options: Max Saving, Min Saving, Disabled, and User Defined.
IV. BIOS SOFTWARE Suspend Switch This field enables or disables the SMI connector on the motherboard. This connector connects to the lead from the Suspend switch mounted on the system case. Default setting for this field is Enabled. Doze Speed, Stdby Speed These two fields set the CPU speed during each mode. The number indicates what the normal CPU speed is divided by. PM Timers This section controls the time-out settings for the Power Management scheme.
IV. BIOS SOFTWARE PNP and PCI Setup This “PNP and PCI Setup” option configures the PCI bus slots. All PCI bus slots on the system use INTA#, thus all installed PCI cards must be set to this value. The first four fields on the screen set how IRQ use is determined for each PCI slot. The default setting for each field is Auto, which uses auto-routing to determine IRQ use. The other options are manual settings of 14 or 15 for each slot. IV.
IV. BIOS SOFTWARE ISA MEM Block BASE This field allows you to set the base address and block size of a Legacy ISA card that uses any memory segment within the C800H and DFFFH address range. If you have such a card, and you are not using an ICU to specify its address range, select a base address from the six available options; the ISA MEM Block SIZE field will then appear for selecting the block size.
IV. BIOS SOFTWARE Load BIOS Defaults This “Load BIOS Defaults” option allows you to load the troubleshooting default values permanently stored in the BIOS ROM. These default settings are non-optimal and disable all high performance features. To load these default settings, highlight “Load BIOS Defaults” on the main screen and then press the key. The system displays a confirmation message on the screen. Press the key and then the key to confirm.
IV. BIOS SOFTWARE Supervisor Password and User Password IV. BIOS (Passwords) These two options set the system passwords. “Supervisor Password” sets a password that will be used to protect the system and the Setup utility; “User Password” sets a password that will be used exclusively on the system. By default, the system comes without any passwords. To specify a password, highlight the type you want and then press the key. A password prompt appears on the screen.
IV. BIOS SOFTWARE IDE HDD Auto Detection This “IDE HDD Auto Detection” option detects the parameters of an IDE hard disk drive, and automatically enters them into the Standard CMOS Setup screen. ROM PCI/ISA BIOS (PI55T2P4) CMOS SETUP UTILITY AWARD SOFTWARE, INC.
IV. BIOS SOFTWARE IMPORTANT: If your hard drive was already formatted on an older previous system, incorrect parameters may be detected. You will need to enter the correct parameters manually or use low-level format if you do not need the data stored on the hard drive. If the parameters listed differ from the ones used when the drive was formatted, the drive will not be readable. If the auto-detected parameters do not match the ones that should be used for your drive, do not accept them.
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V. DESKTOP MANAGEMENT Desktop Management Interface (DMI) Introducing the ASUS DMI Configuration Utility System Requirements The motherboard BIOS must support DMI. The following motherboards do not support DMI: • P/I-P6RP4 • PCI/E-P54NP4 • PCI/I-P54NP4D (not supported) (not supported) (not supported) V. DMI (DMI Introduction) (Flash Memory Writer) This motherboard supports DMI within the BIOS level and provides a DMI Configuration Utility to maintain the Management Information Format Database (MIFD).
V. DESKTOP MANAGEMENT Using the ASUS DMI Configuration Utility Edit DMI (or delete) Use the ←→ (left-right) cursors to move the top menu items and the ↑↓ (up-down) cursor to move between the left hand menu items. The bottom of the screen will show the available keys for each screen. Press enter at the menu item to enter the right hand screen for editing. “Edit component” appears on top. The reversed color field is the current cursor position and the blue text are available for editing.
V. DESKTOP MANAGEMENT Save MIFD You can save the MIFD (normally only saved to flash ROM) to a file by entering the drive and path here. If you want to cancel save, you may press ESC and a message “Bad File Name” appears here to show it was not saved. Load MIFD You can load the disk file to memory by entering a drive and path and file name here. V. DMI (Using DMI Utility) Load BIOS Defaults You can load the BIOS defaults from a MIFD file and can clear all user modified and added data.
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VI. ASUS PCI-SC200 SCSI Card VI. ASUS PCI-SC200 (NCR SCSI BIOS) NCR SCSI BIOS and Drivers Aside from the system BIOS, the Flash memory chip on the motherboard also contains the NCR SCSI BIOS. This SCSI BIOS works in conjunction with the optional ASUS PCI-SC200 SCSI controller card to provide a complete PCI Fast SCSI-2 interface. All SCSI devices you install to your system require driver software to function. The NCR SCSI BIOS directly supports SCSI hard disks under the DOS, Windows and OS/2 environments.
VI. ASUS PCI-SC200 SCSI Card VI. ASUS PCI-SC200 (Setup) The ASUS PCI-SC200 SCSI Interface Card Your motherboard may have come with an optional SCSI (Small Computer System Interface) controller card, the PCI-SC200. The card is also available separately. This card works with the SCSI BIOS on the motherboard. Together, they provide a complete PCI Fast SCSI-2 interface. With the card installed in your system you can connect SCSI devices installed in your system case to the internal connector on the card.
VI. ASUS PCI-SC200 SCSI Card VI. ASUS PCI-SC200 (Jumpers) Setting the INT Assignment You must use PCI INT A setting in order to properly assign the card's interrupt. On the ASUS PCI-SC200, you assign the INT by setting jumper JP1 or JP2. The default setting for the card already is INT A, so you do not need to change the setting to use the ASUS PCI-SC200 with this motherboard.
VI. ASUS PCI-SC200 SCSI Card VI. ASUS PCI-SC200 (SCSI ID Numbers) Decide whether or not you need to terminate the ASUS PCI-SC200 based on its position in the SCSI chain. Only the devices at each end of the chain need to be terminated. If you have only internal or only external devices connected to the ASUS PCI-SC200, then you must terminate the ASUS PCI-SC200. If you have both internal and external devices connected, you must not terminate the card. See the following example which illustrates this concept.
VII. ASUS I-A16C Audio Card NOTE: The ASUS I-A16C 16-bit ISA audio card comes with certain motherboard packages and is not for sale separately. ASUS I-A16C Audio Features Creative Labs ViBRA 16C PnP Audio Chip Full Duplex Supports 16/8 bit PCM 5KHz to 44.1KHz Wave Table Upgradeable Software Includes: DOS and Window 3.1 Drivers Windows 95 Driver Wave Editor Wave OLE Quick CD Mixer Control Quick Player VII.
VII. ASUS I-A16C Audio Card Layout and Connectors Panasonic Audio In PC Speaker In Volume Control Mitsumi Audio In Sony Audio In Wave Table Upgrade PC Speaker Out Speaker Out Line Out VII. ASUS I-A16C (Layout / Connectors) Line In Microphone MIDI/Game Connectors The audio input connectors are used when you wish to control software mixer settings (bass, treble, volume, etc.) for audio CD's that are played with your CD-ROM.
